When opening an audio file with a right click menu option why not change
the window design to suit an audio file.
You don't need a video section if you are converting one
audio file. You have done this for your MP3 presets (See image)

And when the user is launching ffconvert from the start menu
why not ask the user if he will be converting an audio or
a video file and change the window design according to the answer.

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